Here’s the first trailer. It begins with Sekiro protecting his charge, Kuro. We see Genichiro find the two and attack, kidnapping the boy. From there, we see him head on his mission to find his master ...
Since Akane-banashi debuted in Weekly Shonen Jump, both MangaPlus and Viz Media offered chapters of the manga in English weekly, but there’s no confirmation about any company picking up the anime yet.